Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Dedicated to Professor P. Sinaÿ on the occasion of his 62nd birthday. ... A new formal stereoselective synthesis of (+)-huperzine A 1 was achieved using as a key step a palladium mediated annulation between 2-methylene-1,3-propanediol diacetate and (1R,2S)-2-phenylcyclohexanol ...